BIOLOGY 101 Lecture Notes - Lecture 10: Enkephalin, Psilocybin, Preterm Birth

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A ps(cid:455)(cid:272)hoa(cid:272)ti(cid:448)e drug alters o(cid:374)e"s (cid:373)ood or e(cid:373)otio(cid:374)al state. Hence, they can cross the blood-brain barrier. They alter communication between neurons by affecting the actions of neurotransmitters. Dependence: occurs when someone can no longer function normally without the drug, the drug is needed for physical or psychological well-being, certai(cid:374) drugs sti(cid:373)ulate the (cid:862)pleasure (cid:272)e(cid:374)ters(cid:863) i(cid:374) the li(cid:373)(cid:271)i(cid:272) s(cid:455)ste(cid:373) a(cid:374)d e(cid:374)(cid:272)ourage continued use. Al(cid:272)oholis(cid:373) is a(cid:373)eri(cid:272)a"s (cid:374)u(cid:373)(cid:271)er o(cid:374)e drug pro(cid:271)le(cid:373). The effects of alcohol on a perso(cid:374)"s (cid:271)eha(cid:448)ior depe(cid:374)d o(cid:374) the (cid:271)lood al(cid:272)ohol le(cid:448)el. Blood alcohol levels depend on its rate of absorption, distribution, and metabolism: 1 g alcohol/100 ml blood blood alcohol level of 1%. The blood alcohol level is affected by how much and how quickly alcohol is consumed. 20% of alcohol is absorbed at the stomach. The effects of alcohol are felt in about 15 minutes. The remaining alcohol is absorbed through the intestines. Alcohol is then distributed to all body tissues.

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